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  Age dating of an early Milky Way merger via asteroseismology of the naked-eye star ν Indi

Chaplin, W. J., Serenelli, A. M., Miglio, A., Morel, T., Mackereth, J. T., Vincenzo, F., et al. (2020). Age dating of an early Milky Way merger via asteroseismology of the naked-eye star ν Indi. Nature astronomy, 4, 382-389. doi:10.1038/s41550-019-0975-9.

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Chaplin, William J., Author
Serenelli, Aldo M., Author
Miglio, Andrea, Author
Morel, Thierry, Author
Mackereth, J. Ted, Author
Vincenzo, Fiorenzo, Author
Kjeldsen, Hans, Author
Basu, Sarbani, Author
Ball, Warrick H., Author
Stokholm, Amalie, Author
Verma, Kuldeep, Author
Mosumgaard, Jakob Rørsted, Author
Aguirre, Victor Silva, Author
Mazumdar, Anwesh, Author
Ranadive, Pritesh, Author
Antia, H. M., Author
Lebreton, Yveline, Author
Ong, Joel, Author
Appourchaux, Thierry, Author
Bedding, Timothy R., Author
Christensen-Dalsgaard, Jørgen, AuthorCreevey, Orlagh, AuthorGarcía, Rafael A., AuthorHandberg, Rasmus, AuthorHuber, Daniel, AuthorKawaler, Steven D., AuthorLund, Mikkel N., AuthorMetcalfe, Travis S.1, AuthorStassun, Keivan G., AuthorBazot, Michäel, AuthorBeck, Paul G., AuthorBell, Keaton J.2, Author           Bergemann, Maria, AuthorBuzasi, Derek L., AuthorBenomar, Othman, AuthorBossini, Diego, AuthorBugnet, Lisa, AuthorCampante, Tiago L., AuthorOrhan, Zeynep Çelik, AuthorCorsaro, Enrico, AuthorGonzález-Cuesta, Lucía, AuthorDavies, Guy R., AuthorMauro, Maria Pia Di, AuthorEgeland, Ricky, AuthorElsworth, Yvonne P., AuthorGaulme, Patrick3, Author           Ghasemi, Hamed, AuthorGuo, Zhao, AuthorHall, Oliver J., AuthorHasanzadeh, Amir, AuthorHekker, Saskia2, Author           Howe, Rachel, AuthorJenkins, Jon M., AuthorJiménez, Antonio, AuthorKiefer, René, AuthorKuszlewicz, James S.2, Author           Kallinger, Thomas, AuthorLatham, David W., AuthorLundkvist, Mia S., AuthorMathur, Savita, AuthorMontalbán, Josefina, AuthorMosser, Benoit, AuthorBedón, Andres Moya, AuthorNielsen, Martin Bo, AuthorÖrtel, Sibel, AuthorRendle, Ben M., AuthorRicker, George R., AuthorRodrigues, Thaíse S., AuthorRoxburgh, Ian W., AuthorSafari, Hossein, AuthorSchofield, Mathew, AuthorSeager, Sara, AuthorSmalley, Barry, AuthorStello, Dennis, AuthorSzabó, Róbert, AuthorTayar, Jamie, AuthorThemeßl, Nathalie2, Author           Thomas, Alexandra E. L., AuthorVanderspek, Roland K., Authorvan Rossem, Walter E., AuthorVrard, Mathieu, AuthorWeiss, Achim, AuthorWhite, Timothy R., AuthorWinn, Joshua N. Winn , AuthorMutluf, Yıldız, Author more..
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              
2Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              
3Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              


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 Abstract: Over the course of its history, the Milky Way has ingested multiple smaller satellite galaxies1. Although these accreted stellar populations can be forensically identified as kinematically distinct structures within the Galaxy, it is difficult in general to date precisely the age at which any one merger occurred. Recent results have revealed a population of stars that were accreted via the collision of a dwarf galaxy, called Gaia–Enceladus1, leading to substantial pollution of the chemical and dynamical properties of the Milky Way. Here we identify the very bright, naked-eye star ν Indi as an indicator of the age of the early in situ population of the Galaxy. We combine asteroseismic, spectroscopic, astrometric and kinematic observations to show that this metal-poor, alpha-element-rich star was an indigenous member of the halo, and we measure its age to be 11.0±0.7 (stat) ±0.8 (sys) billion years. The star bears hallmarks consistent with having been kinematically heated by the Gaia–Enceladus collision. Its age implies that the earliest the merger could have begun was 11.6 and 13.2 billion years ago, at 68% and 95% confidence, respectively. Computations based on hierarchical cosmological models slightly reduce the above limits.


Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41550-019-0975-9
 Degree: -



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Title: Nature astronomy
Source Genre: Journal
Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 4 Sequence Number: - Start / End Page: 382 - 389 Identifier: ISSN: 2397-3366
CoNE: https://pure.mpg.de/cone/journals/resource/2397-3366